If you’re pretty certain that the amount of water from the water heater equals what you figure leaked into the belly, it sounds like you’re good to close it up.
Temperatures being what you say are coming, make sure to tape it up tight.
Hoping the best is yet to come. Good job.
__________________
Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain